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<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 30 - Try It (Join)</title>
</head>
<body>
  <h1>Mixed Alphabet Pattern (Join)</h1>
  <p>Edit the row count or loops, then click Run.</p>
  <pre id="output" style="font-family: monospace; white-space: pre;"></pre>
  <script>
    let rows = 5;
    rows = Math.max(1, Math.min(rows, 26));
    const base = "A".charCodeAt(0);
    const top = base + rows - 1;
    let result = "";

    for (let r = 0; r < rows; r++) {
      const start = base + r;
      const end = top - r;
      const row = [];
      for (let code = start; code >= base; code--) {
        row.push(String.fromCharCode(code));
      }
      for (let code = base + 1; code <= end; code++) {
        row.push(String.fromCharCode(code));
      }
      result += row.join("") + "\n";
    }

    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Alphabet Pattern 30 (Try It - Join)